Three problems related to check engine light on have been reported for the 2009 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 GMC Sierra 1500 based on all problems reported for the 2009 Sierra 1500.
At around 100,000 miles, the check engine light would come on and indicate low oil pressure. Changing the sensor out did not effect the situation. Changing the oil would help but usually only for around 3,500 miles. The engine was losing oil more than it should. Then at around 129,000 miles, the truck starting shaking because of the engine and the check engine light came on. It was determined to be a cylinder 7 misfire. Changing the coil pack, spark plug, and spark plug wire did nothing. It was determined that the engine was irreparable and needed replacing. Upon research, it appears that this is a fairly common problem among 2008-2012 gm engines with the afm system. Gm should absolutely issue a recall and repair these defective engines or otherwise reimburse the owners for the repairs.
Driving only 20 mph in the process of stopping. Check engine light came on. Very difficult to stop. Engine ran very rough. After stopping the vehicle would only accelerate up to approx 25 mph. Stopped again and turned off engire. Re-started engine and was able to drive to a Chevrolet dealership with the check engine light still on. Dealership replaced sensor ki.
The contact owns a 2009 GMC Sierra 1500. The contact was driving 65 mph when the check engine warning light illuminated as the vehicle began to decelerate independently. The vehicle would not accelerate any further until the engine was shut off and restarted several moments later. The vehicle was taken to the dealer twice for the failure but they were unable to duplicate the problem. The manufacturer was contacted but offered no assistance. The failure mileage was 12,300.